Shadowless portable lamp with shade



April 28, 1931. A. 1.. ARENBERG SHADOWLESS PORTABLE LAMP WITH SHADE Filed Jan. 31, 1929 Patented Apr. 28, 1931 UNITED STATES ALBERT L. ARENBERG, OF CHICAGO, ILLINOIS SHADOWLESS PORTABLE LAMP WITH SHADE Application filed January 31, 1929. Serial No. 336,619.

combine the advantages of shadowless illumination with those of portability and adjustability while at the same time providing an attractive fixture including an illum1- nated shade.

One of the important objects of this invention is to provide in a shadowless lamp means for dispersing and diffusing light rays therefrom outwardly and upwardly while at the same time directing a portion of the light rays downwardly and outwardly to illuminate the shade of the lamp.

Still another and further im ortant object of this invention is to provi e a portable lamp which will accomplish shadowless illumination while at the same time'simulating the ordinary portable lamp with ornamental shade heretofore used.

Another and still further important object of the invention is the provision in a shadowless portable lamp having a shade thereon of means for adjusting the height of the lamp so that the direct glare of the rays will be in a plane above that of the users eyes, thereby avoiding consequent eye strain.

Other and further important objects of the invention will be apparent from the disclosures in the accompanying drawings and following specification.

The invention, in a preferred form, is

- illustrated in the drawings and hereinafter more fully described.

In the drawings:

Figure l is a vertical view partly in section of the improved shadowless ortable lamp of this invention showing a s ade in position thereon.

Figure 2 is a side elevation lamp illustrating a preferred heightadjusting apparatus.

igure 3 is a to plan view of the lamp with the globe an shade removed showing the interior construction.

As shown in the drawings:

The reference numeral 10 indicates gen.-

of a similar erally the body of the improved shadowless lamp of this invention which may be of any size or shape and of any ornamental design.

Mounted in a suitable socket 12 in the body 10 is a source of light, preferably a light globe 14 of any desired size and ower the surface of which is preferably rosted so as to provide diffused light.

Surrounding the lamp globe 14 and also mounted on the body 10 is a reflector 16 approximately bowl-shaped as shown, but which obviously may be of any shape or any curvature so as to provide for an outward and upward reflection of the light rays emanating from the globe 14. The inner surface of the reflector or shell 16 is highly polished and may be of any desired or suitable meter)? sea as silver plate, mirrored glass, or whole shell may be composed of some m,.;;i,l capable of acquiring a high polish so that the desired reflecting efi'ect be obtained.

A suitable shade i8 is supported upon the shell 16 by means of a rim orthe like 20 which farms the upper periphery of the shade 18 and is merely hung upon the upper rim of the shell 16. The shade 18 may be of any desired material such as parchment er cloth, and mayv have ornamental figures thereon as is usua In order that the inner surface of the shade may be illuminated thereby rendering the same and the ornamentations thereon visible, a series of openings 22 is formed in the bottom 24 of the shell 16 which may be either integral therewith or comprise a separate plate, and directly below the plate 24 is positioned an auxiliary reflector 26 preferably having its outer rim bent upwardly as best shown in Fi re 1. The inner face of reflector 26 1s depolished so as to reflect light rays pwsing through the openings 22 upwardly and outwardly, some against the shade 18 and some against the outer surface of the shell 16 whlch is finished or polished to some extent so that these light rays are also reflected against the shade 18, thereby providing for a suitable degree of illumination thereof.

It will be obvious that the majority of the light from the source 14 passes upwardly and outwardly through the open top of the shell 16, thereby providing a diffused shadowless illumination in a lamp having a shade and which shade is at the same time illuminated so as to simulate the ordinary ornamental lamps now in use. At the same time, the lamp itself, being mounted on a base or stand not shown, is readily portable and can be moved from place to place, thereby afi'ording a source of indirect shadowless illumination for residences, households, and the like, which has heretofore been accomplished only in fixtures the use of which was necessarily limited.

At the same time, the height of the lamp can be adjusted with respect to the level of the users eyes, this being accomplished in several ways, a simple method being illustrated in Fi ure 1 consisting merely of a set screw 30 tted into a sleeve 32 surrounding the supporting stem 34 of the lam whereby the height may be adjustably fixed.

A slightly more ornamental means of adjustment is shown in Figure 2 wherein a slidable support having a lamp bracket 42 thereon is frictionally mounted on a stem 44 forming an extension of the stand 46 of the lamp. The current carrying cord 48 connects the slidable element 40 to the stand 46 in a manner somewhat as illustrated in Figure 2. The lamps are provided with pull chains 50 and 52 respectively by means of which the current may be switched on and off as .desired.

It will be evident that herein is provided a shadowless portable lamp having an ornamental shade applied thereto which lamp combines in one fixture the elements of portability and attractiveness, while at the same time providing a source of shadowless light, the beneficial results and usages of which will be quite evident.

I am aware that many changes may be made, and numerous details of construction varied throughout a wide range without departing from the spirit of this invention, aiid we therefore do not purpose limiting the patent granted hereon otherwise than as necessitated by the prior art.

ture.

ALBERT L. ARENBERG. 

